In this shrinking world, states are increasingly interdependent and interconnected, a development that has affected international law. Early international law dealt with bilateral relations between autonomous states. The principal subjects until well into this century were diplomatic relations, war, treaties and the law of the sea. One of the most significant developments in international law during the twentieth century has been the expanded role played by multilateral treaties addressed to the common concerns of states. Often they clarify and improve rules of international law through the process of rendering them in binding written agreements. These treaties also promote the coordination of uniform state behavior in a variety of areas. International organizations, themselves the creatures of multilateral treaties, have also assumed increasing prominence in the last half of this century. They contribute to the coordination and facilitation of contemporary international relations on the basis of legal principles.

At this pivotal point in history, a fundamental and oft-raised issue is “international governance.” Means of effective governance are seen as necessary to more complex arrangements of world order. But achieving effective governance ultimately will mean the existence of institutions that legislate, that is, institutions that make decisions binding on the whole. As a general matter, states have been skeptical of, if not hostile toward and consequently unwilling to accept, such governance. The United Nations Security Council is a notable exception; in the sometimes broad, sometimes narrow, area of international peace and security, the Security Council has taken decisions in the name of, and binding upon, the entire international community.